年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
EXPERIMENTAL STUDY ON BREAKUP CHARACTERISTICS OF GELLED KEROSENE DROPLET IN MEDIUM-SPEED AIRSTREAM
要約
This study presents the breakup characteristics of gelled kerosene droplets in medium-speed airstream using high-speed visualization and image processing. An experimental platform is established, and three kinds of kerosene gels with different concentrations of nano-silica gallant (1, 2, and 3 wt%) are prepared. The breakup process is tracked and photographed under the different Weber and Ohnesorge numbers (82 < We < 691, 0.00096 < Oh < 1.34). The breakup modes and behaviors, deformation characteristics, and temporal and spatial distribution are explored and analyzed in detail, and compared to liquid kerosene droplets. Droplet viscosity and corresponding Oh number are calculated applying a shear-rate control parameter. The results show two breakup behaviors called "shear-stripping mode" and "catastrophic mode," and for each mode the breakup process of the three kinds of gelled droplets is similar to liquid kerosene. Compared with 1%, 2% kerosene gel and liquid kerosene, 3% gelled kerosene has a higher transition We number due to its evidently increased viscosity. The maximum deformations of liquid kerosene and gelled kerosene droplets are largely between 2 and 3.5 which display a random variation with We number. The initial breakup time locates near the value of 1.59 for all the four droplets. The total-to-initial breakup time ratio of gelled kerosene decreases with Oh number increasing and then tends to be a constant which is very close to Newtonian fluid. The distribution area of the child droplets is enlarged with We number enhanced but is shrunken as gellant concentration is improved.
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Arcoumanis, C., Whitelaw, D.S., and Whitelaw, J.H., Breakup of Droplets of Newtonian and Non-Newtonian Fluids, Atomiz. Sprays, vol. 6, no. 3, pp. 245-256, 1996.
-
Arnold, R., Santos, P.H.S., Campanella, O.H., and Anderson, W.E., Rheological and Thermal Behavior of Gelled Hydrocarbon Fuels, J. Propul. Power, vol. 27, no. 1, pp. 151-161, 2011.
-
Brodkey, R.S., The Phenomena of Fluid Motions, Boston: Addison-Wesley, 1967.
-
Cai, F.J. and Zhang, M.Z., Status and Problems of Gelled Propellants Atomization Research, J. Rocket Propul., vol. 36, no. 4, pp. 24-30, 2010.
-
Chou, W.H., Hsiang, L.P., and Faeth, G.M., Temporal Properties of Drop Breakup in the Shear Breakup Regime, Int. J. Multiphase Flow, vol. 23, no. 4, pp. 651-669, 1997.
-
Dai, Z. and Faeth, G.M., Temporal Properties of Secondary Drop Breakup in the Multimode Breakup Regime, Int. J. Multiphase Flow, vol. 27, no. 2, pp. 217-236, 2001.
-
Gelfand, B.E., Gubin, S.A., Kogarko, S.M., and Komar, S.P., Singularities of the Breakup of Viscous Liquid Droplets in Shock Waves, J. Eng. Phys., vol. 25, no. 3, pp. 1140-1142, 1973.
-
Guildenbecher, D.R., Lopez-Rivera, C., and Sojka, P.E., Secondary Atomization, Exp. Fluids, vol. 46, no. 3, pp. 371-402, 2009.
-
Hsiang, L.P. and Faeth, G.M., Near-Limit Drop Deformation and Secondary Breakup, Int. J. Multiphase Flow, vol. 18, no. 5, pp. 635-652, 1992.
-
Hsiang, L.P. and Faeth, G.M., Drop Deformation and Breakup Due to Shock Wave and Steady Disturbances, Int. J. Multiphase Flow, vol. 21, no. 4, pp. 545-560, 1995.
-
Hwang, S.S., Liu, Z., and Reitz, R.D., Breakup Mechanisms and Drag Coefficients of High-Speed Vaporizing Liquid Drops, Atomiz. Sprays, vol. 6, no. 3, pp. 353-376, 1996.
-
Ibrahim, E.A., Yang, H.Q., and Przekwas, A.J., Modeling of Spray Droplets Deformation and Breakup, J. Propul. Power, vol. 9, pp. 651-654, 1993.
-
Joseph, D.D., Beavers, G.S., and Funada, T., Rayleigh-Taylor Instability of Viscoelastic Drops at High Weber Numbers, J. Fluid Mech., vol. 453, pp. 109-132, 2002.
-
Joseph, D.D., Belanger, J., and Beavers, G.S., Breakup of a Liquid Drop Suddenly Exposed to a High-Speed Airstream, Int. J. Multiphase Flow, vol. 25, nos. 6-7, pp. 1263-1303, 1999.
-
Kirchberger, C.U., Stiefel, A.D., Kurilov, M., and Ciezki, H.K., Overview of Recent Gel Propellant Activities at DLR Lampoldshausen, 2018 Joint Propulsion Conf., Cincinnati, Ohio, 2018.
-
Lee, C.S., Kim, H.J., and Park, S.W., Atomization Characteristics and Prediction Accuracies of Hybrid Break-Up Models for a Gasoline Direct Injection Spray, PI Mech. Eng. D-J Aut., vol. 218, pp. 1041-1053, 2004.
-
Liu, H., Qiang, H.F., and Wang, G., Review on Jet Impingement Atomization of Gelled Propellant, Chin. J. Energetic Mater., vol. 23, no. 7, pp. 697-708, 2015.
-
Liu, L.H., Fu, Q.F., and Yang, L.J., Theoretical Atomization Model of Liquid Sheet Generated by Coaxial Swirl Injectors, Int. J. Multiphase Flow, vol. 142, p. 103725, 2021.
-
O'Rourke, P.J. and Amsden, A.A., The TAB Method for Numerical Calculation of Spray Droplet Breakup, Int. Fuels Lubricants Meeting Expos., Toronto, Ontario, 1987.
-
Padwal, M.B., Natan, B., and Mishra, D.P., Gel Propellants, Prog. Energy Combust. Sci., vol. 83, pp. 1-150, 2021.
-
Park, J.H., Yoon, Y., and Hwang, S.S., Improved TAB Model for Prediction of Spray Droplet Deformation and Breakup, Atomiz. Sprays, vol. 12, pp. 387-401, 2002.
-
Park, S.W., Kimb, S., and Chang, S.L., Breakup and Atomization Characteristics of Mono-Dispersed Diesel Droplets in a Cross-Flow Air Stream, Int. J. Multiphase Flow, vol. 32, pp. 807-822, 2006.
-
Pilch, M. and Erdman, C.A., Use of Breakup Time Data and Velocity History Data to Predict the Maximum Size of Stable Fragments for Acceleration-Induced Breakup of a Liquid Drop, Int. J. Multiphase Flow, vol. 13, no. 6, pp. 741-757, 1987.
-
Qian, L., Zhong, X., Zhu, C., and Lin, J., An Experimental Investigation on the Secondary Breakup of Carboxymethyl Cellulose Droplets, Int. J. Multiphase Flow, vol. 136, p. 103526, 2021.
-
Ranger, A.A. and Nicholls, J.A., Aerodynamic Shattering of Liquid Drops, AIAA, vol. 7, pp. 285-290, 1969.
-
Rivera, C., Secondary Breakup of Inelastic Non-Newtonian Liquid Drops, PhD, Purdue University, 2010.
-
Shraiber, A.A., Podvysotsky, A.M., and Dubrovsky, V.V., Deformation and Breakup of Drops by Aerodynamic Forces, Atomiz. Sprays, vol. 6, pp. 667-692, 1996.
-
Snyder, S., Secondary Atomization of Elastic Non-Newtonian Liquid Drops, Master, Purdue University, 2011.
-
Tanner, F.X., Liquid Jet Atomization and Droplet Breakup Modeling of Non-Evaporating Diesel Fuel Sprays, SAE Trans.: J. Engines, vol. 6, pp. 127-140, 1997.
-
Taylor, G.I., The Shape and Acceleration of a Drop in a High Speed Air Stream, Sci. Papers GI Taylor, vol. 3, pp. 457-464, 1963.
-
Trinh, H.P. and Chen, C.P., Development of Liquid Jet Atomization and Breakup Models Including Turbulence Effects, Atomiz. Sprays, vol. 16, pp. 907-932, 2006.
-
Wierzba, A. and Takayama, K., Experimental Investigation of the Aerodynamic Breakup of Liquid Drops, AIAA, vol. 26, pp. 1329-1335, 1988.
-
Yang, L.J. and Liu, L.H., Research Progress in Atomization Characteristics of Non-Newtonian Fluid Jet, Acta Aeronautica Astronautica Sinica, vol. 42, pp. 1-29, 2021.
-
Zhao, H., Study on the Mechanism of Coaxial Air-Blast Atomization, PhD, East China University of Science and Technology, 2012.
-
Zhao, H., Liu, H.F., Cao, X.K., Li, W.F., and Xu, J.L., Breakup Characteristics of Liquid Drops in Bag Regime by a Continuous and Uniform Air Jet Flow, J. Multiphase Flow, vol. 37, pp. 530-534, 2011a.
-
Zhao, H., Liu, H.F., Xu, J.L., and Li, W.F., Experimental Study of Drop Size Distribution in the Bag Breakup Regime, I&EC Res., vol. 50, pp. 9767-9773, 2011b.
-
Zhao, H., Liu, H.F., Xu, J.L., and Li, W.F., Secondary Breakup of Coal Water Slurry Drops, Phys. Fluids, vol. 23, pp. 1-12, 2011c.
-
Zhao, H., Hou, Y.B., Liu, H.F., Tian, X.S., Xu, J.L., Li, W.F., Liu, Y., Wu, F.Y., Zhang, J., and Lin, K.F., Influence of Rheological Properties on Air-Blast Atomization of Coal Water Slurry, J. Non-Newtonian Fluid Mech., vol. 211, pp. 1-15, 2014.